Face mask assembly



FIG. 1 is a perspective view of a face mask assembly showing our design;

FIG. 2 is a front elevational view thereof:

FIG. 3 is a rear elevational view thereof, the broken lines in FIG. 3 are included for the purpose of illustrating a portion of the face mask assembly that form no part of the claimed design;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a face mask assembly, as shown and described. 